Muffler.



No. 733,330. BATENTED JULY 7 1903.

A. G. NEW.

MUFFLER.

APPLICATION rum mm. 30, 1899.

no MODEL.

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UNITED STATES I Patented July 7, 1903. PATENT ()FFICE.

ANTHONY GEORGE NEW, OF \VOKING, ENGLAND.

MUFFLER.

SPECIFICATION forming part of Letters Patent No. 733,330, dated July 7,1903.

Application filed December 30,1899. Serial No. 742,117. (No model.)

T0 at whom it may concern.-

Be it known that I, ANTHONY GEORGE NEW, a subject of the Queen of GreatBritain, residing at The Voltage, lVoking, in the county of Surrey,England, have invented certain new and useful Improvements in Mufflers;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

Myinvention relatesto certain new and useful improvements ingas-engines, and especially to that part of a gas-engine known as themuffler, which has for its object to prevent or reduce any noise frombeing caused by the exhaust-gases issuing from oil or gas engines andthe like to the atmosphere, and is particularly applicable for use onmotordriven vehicles propelled by such engines. Hitherto theexhaust-gases have usually been lead through a suitable pipe from theexhaust-valve to a box or muffler and there allowed to expand whilepassing through free or baflled passages in it and have then been freeto escape into the atmosphere. In order to render the gases noiseless,in most cases large orcomplicated exhaust-boxes have been necessary, asotherwise the velocity at which the gases issue from the box issufficiently high to create noise.

The present invention consists in a valve or its equivalent which iscapable of completely closing the passage through which theexhaust-gases issue from the exhaust-box to the atmosphere and which isso arranged that it closes that passage during the period at which theexhaust-gases would otherwise issue noisily and opens it when theirvelocity has more or less subsided during each cycle of operations ofthe engine.

By the use of this device a smaller and lesscomplicated exhaust-box maybe employed and a more effective silencing obtained.

In certain cases a second box may be advantageously employed to receivethe gases which issue from the valve at the exit from the first box,this second box being similarly provided with a controlling-valve in itsexitpassage. Any'number of boxes may be added in this manner.

In cases where more than one engine-cylinder is working and when theexplosions of each are non-coincident separate boxes with valves maypreferably be used; but if only box or series of boxes is used for atwo-cylinder engine of this kind then the valve or valves would bearranged to open and close twice during each cycle of the engine.

I prefer to actuate the valve in such a manner that it closes suddenlyand opens gradually; but Imay vary the rapidity, as also the relativemoments, of either of its actions to suit individual requirements.

Referring to the accompanying drawing, forming part of thisspecification, the figure shown represents a central longitudinalsectional view of a muffler embodying my invention. 1

In the drawing, B is a chamber, into which the exhaust-gases are ledfrom the engine through the pipe A. The only means of escape from thechamber B is through the passage or pipe I), which is controlled by avalve or valves, as shown. A pair'of valves H H are fixed upon a spindleF, which is carried in suitable bearings or guides F and is provided atthe one end with a funnel-shaped mouth G, located near the inlet-pipe A,but removed therefrom, and at the other end with a spiral spring F whichtends to keep the sliding spindle F in the position shown. The passage Dis providedwith openings 0' G into the chamber B, and these openings areso shaped and arranged that the valves H H can completely close them ifthe spindle F be moved longitudinallyin its hearings or guides (fromright to left) against the action of the spiral spring F The manner inwhich this automatic device works is as follows: When during the Thevelocity at which the gases escape will be less than that at which theyenter the chamber B, owing to their temporary detention.

In certain cases I prefer to construct the valve I-I smaller than thevalve H, because the pressure of the gases in the chamber B then opposesthe action of the spring F until that pressure has subsided to thedesired extent. By this means the valves H H remain closed for a longerperiod than they otherwise would.

It will be understood that by varying the relative sizes of the valves HH and the strength of the spiral spring F, I am able to control theperiod during which the exhaustgases are confined in the chamber 13.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a device of the character described, a chamber having aninlet-opening, an outlet-pipe projecting within the chamber and providedwith valve-seats in oppositely-disposed openings, guides in the chamber,a rod extending through said openings and slidably mounted in theguides, a pair of valves of different sizes mounted on the rod and adapted to close the openings in the outlet-pipe, a funnel-shaped mouth-platealso mounted on the rod and located near the inlet-opening, and meansfor giving the rod a pressure in a direction to normally open thevalves, substantially as described.

2. In a device of the character described, a chamber having inlet andoutlet openings, a movable baffle-plate arranged in front of theinlet-opening and normally standing at a slight distance therefrom, aspring-pressed Valve located in front of the outlet-opening and normallystanding away therefrom, and means connecting the baflie-plate with thevalve whereby a rearward movement of the baffle-plate closes the valve.

3. In a device of the character described, a chamber having inlet andoutlet openings, a spring-pressed rod slidably mounted therein, afunnel-shaped baffle-plate secured to the rod with its flaring partlocated in front of the inlet-opening and normally standing at a shortdistance therefrom, and a valve on the rod to close the outlet-openingwhen the baffle-plate is moved backward.

4. In a device of the character described, a chamber having aninlet-opening, an outlet-pipe projecting within the chamber and providedwith valve-seats in oppositely-disposed openings, guides in the chamber,a rod extending through said openings and slidably mounted in theguides, a pair of valves mounted on the rod and adapted to close theopenings in the outletpipe, a funnelshaped mouth-plate also mounted onthe rod and located near the inlet-opening, and means for giving thespindle a pressure in a direction to normally open the valves,substantially as described.

5. In a device of the character described,

a chamber having an inlet-opening, an outlet-pipe projecting within thechambr, a rod slid ably mounted within the chamber, a valve carried bythe rod and adapted to close an outlet-opening in the outlet-pipe, and afunnel-shaped mouth-plate mounted on the end of the rod and located nearthe inletopening, substantially as described.

6. In a device of the character described, a chamber having aninlet-opening, an outlet-pipe projecting within the chamber withitsinner end closed and an outlet-opening in its side, a spring-pressedrod slidably mounted within the chamber, a valve on the rod to close theoutlet-opening, and a baflie-plate on the rod near the inlet-opening.

7. In a device of the character described, a chamber having aninlet-opening, an outlet-pipe projecting within the chamber and providedwith oppositely disposed valveseats, a rod slidably mounted within thechamber, a pair of valves of difierent sizes mounted on the rod andadapted to close the valve-seats of the outlet-pipe, and a baffleplatecarried by the rod near the inlet-opening, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ANTHONY GEORGE NEW. \Vitnesses:

EDMUND S. SNEWIN, WM. 0. BROWN.

